After we got the Jeepster righted, I drove it out. Just had to have everybodies extra water for the radiator.
We'll have two rides for the Jam as far as the plans go right now so a moderate and hard ride should be available.
As far as front & rear lockers go, the diff is LOCKED with any good locker. Right? A LockRite (Aussie Locker, EZ Locker, etc,.) can slip (with a major crunching sound and feel) when it gives. A Detroit has a limited amount of "play" built into it but you are still locked all of the time.
Welded spiders or a spool just have no slip or give. Keep your tires aired up on the street and you can skid your way through the turns. I chirped my tires a lot more when I had a drop in locker in the rear than since when I've had the spool in the rear.
As far as not being able to turn when in four wheel drive on the trails, no, it's harder when fully locked up no matter what mechanical front locker you have. Get a twin stick and make life easier on yourself!